RPI4B: what is needed for /dev/video10 to work ( v4l_m2m )

[AL13N]

Maxime Ripard schreef op 2024-01-02 11:03:
> Hi,
> 
> On Wed, Dec 27, 2023 at 04:19:19PM +0100, AL13N wrote:
>> I have a RPI4B with upstream kernel 6.1 64bit and there is no 
>> /dev/video10
>> present. I thought if I waited a bit more, it would appear in the 
>> kernel,
>> but that was folly on my part.
>> 
>> Currently, watching a movie is painful since the software decoding is 
>> way
>> too slow and it has very low fps on 1080p (or even 720p or even 480p)
>> 
>> IIRC, someone told me something else has to be fixed before the codecs 
>> can
>> be done, but I don't remember what it was, or i didn't find it in my
>> email/the archives.
>> 
>> Can someone tell me what exactly needs to be done (in kernel) so that 
>> I can
>> take a crack at it, (hopefully with some help)?
>> 
>> I don't remember if this was relevant, but there was some talk of 
>> needing to
>> use opengl output with a specific texture format for it to work? or is 
>> that
>> seperate?
> 
> That's something for linux-media. The hardware codec isn't part of vc4
> or v3d, it's a separate controller that requires a separate driver (in
> v4l2).
> 
> That driver isn't upstream, and that would need the first thing to
> tackle.
> 
> Maxime

Can I assume you're talking about the vchiq driver, which would have 
multiple things including codecs, or am I misunderstanding it?